The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- API (2 members)
- API Discussion (0 members)
- Application (13 members)
- Archived (29 members)
- Article management templates (61 members)
- Article stubs (9 members)
- Beta (270 members)
- Blog posts (60 members)
- Bracket templates (2 members)
- Browse (0 members)
- CC-BY-SA-3.0 Images (0 members)
- CC-BY-SA-4.0 Images (1 member)
- CSS (663 members)
- CSS/Bug fixes (7 members)
- CSS/Discussions (2 members)
- CSS/Editing customizations (30 members)
- CSS/Libraries (19 members)
- CSS/Personal use (556 members)
- CSS/Retro (86 members)
- CSS/Site-wide use (334 members)
- CSS/Site enhancements (130 members)
- CSS/Unknown use (0 members)
- CSS/User customizations (257 members)
- CSS/Vanilla MediaWiki use (2 members)
- CSS Development (0 members)
- Candidates for deletion (6 members)
- Community (13 members)
- Content (22 members)
- Content by language (3 members)
- Content by status (6 members)
- Content without description (0 members)
- Content without type categorization (0 members)
- Data modules (1 member)
- Demo pages (17 members)
- Deprecated modules (2 members)
- Disambiguations (0 members)
- Discussions Scripts (72 members)
- Documentation modules (7 members)
- Documentation templates (16 members)
- Example images (4 members)
- Experimental (39 members)
- Extensions (1 member)
- FANDOM Engineering (36 members)
- Failing Lua test suites (10 members)
- Fandom Developers Wiki (54 members)
- Files (2 members)
- Formatting templates (3 members)
- Forums (17 members)
- General wiki modules (3 members)
- General wiki templates (34 members)